// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_
#define UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_

#include "ui/events/events_export.h"
#include "ui/events/platform/platform_event_types.h"

namespace ui {

// PlatformEventObserver can be installed on a PlatformEventSource, and it
// receives all events that are dispatched to the dispatchers.
class EVENTS_EXPORT PlatformEventObserver {
public:
    // This is called before the dispatcher receives the event.
    virtual void WillProcessEvent(const PlatformEvent& event) = 0;

    // This is called after the event has been dispatched to the dispatcher(s).
    virtual void DidProcessEvent(const PlatformEvent& event) = 0;

protected:
    virtual ~PlatformEventObserver() { }
};

} // namespace ui

#endif // UI_EVENTS_PLATFORM_PLATFORM_EVENT_OBSERVER_H_
